United States 15-cent windmill stamp from the Windmills USA booklet series, Scott #1738-42

The Windmills USA stamp series was issued by the United States Postal Service on February 7, 1980, as part of a booklet pane featuring five different American windmill designs. These stamps celebrated the historical importance of windmills in American agriculture and rural development, showcasing various regional windmill styles including the Virginia, Rhode Island, Massachusetts, Illinois, and Texas windmills. The 15-cent denomination was the standard first-class postage rate at that time. These stamps are particularly appealing to philatelists who specialize in American history, agricultural heritage, and thematic collections focused on renewable energy or rural Americana. The booklet format and the variety of windmill designs make complete sets especially desirable among stamp collectors. First Day Covers and stamps with clear cancellations from 1980 are valued for their historical documentation of postal rates and American cultural heritage during this period.